Communication relays RF sensors three advantages

　　RF sensors for communication relays are mainly electromechanical communication relays RF sensors, and the proportion of RF sensors for solid communication relays is very small. The main reason is that compared with other types of communication relays RF sensors, electromechanical communication relays RF sensors have many advantages: large switching range, low on-resistance, high off state insulation resistance; The dielectric voltage between the coil and the contact is high (>2500V), and the dynamic contact is 1500V; Good RF characteristics; Easy to use. More importantly, it is durable, reliable and low cost, even in hazardous environments. Electromechanical communication relays RF sensors also have disadvantages, such as the magnetic field generated by the coil will form electromagnetic and RF interference to other components; The contact reed may damage the circuit at the moment of switching when energized; Communication relays RF sensors, advantages the service life depends on the contact material and so on. However, the electromechanical communication relay RF sensor can meet the additional requirements of communication applications through continuous innovation, such as reducing the space and height of the board, reducing the volume, gas sealed communication relay RF sensor, increasing the surge requirements (>2500V, peak current 500A), SMD capability (welding temperature up to 260℃) and so on. With the transition from the third generation to the fourth generation of RF sensors for communication relays, in order to adapt to the increasingly demanding requirements of components for communication applications, there have been new changes and developments in RF sensors for communication relays abroad in terms of technology, design, and new materials.

　　Start with "ENG" technology, a basic technology that enhances the performance of RF sensors in communication relays. "ENG" is the abbreviation of Electro negative-gasses, which means Negative electric gases. Typical negative electric gases include SF6 (sulfur hexafluoride), CF4 (carbon tetrafluoride), etc. This gas has superior dielectric properties compared with air and nitrogen. It has become the dominant arc extinguishing medium and insulating medium in medium and high voltage switching equipment. The foreign industry believes that ENG technology may be the most innovative means of further miniaturization of RF sensors for electromechanical communication relays. ENG technology can increase the dielectric withstand voltage by two times without increasing the dielectric distance. In harsh environments, the performance of the RF sensor of the communication relay is normal, and the housing remains intact, with no negative impact on durability.

　　Technical aspect

　　In addition, there is also a technical flat coil system that is respected abroad. Flat coils are manufactured by micromachining. A simple flat coil chip (for the final assembly process) is formed by integrating the coil and magnetic pole on a thin iron sheet through a photolithography and plating process, as shown in Figure 1. Lithography technology allows the integration of hundreds of magnetic circuit chips on the wafer. Because only the barrier plate (masking frame) needs to be changed, various sensitive voltages and coil voltages are relatively easy to achieve.

　　The use of this technology can reduce the cost of products while producing high precision, and has good repeatability. Abroad, this technology is called "a major technology to realize the miniaturization of RF sensors for the next generation of communication relays."

　　Design aspect

　　The development process is controlled by the difference between the capacitance electrostatic energy change and the mechanical energy stored in the reset spring during the development process. This electrostatic drive mechanism than the electromagnetic communication relay RF sensor motor power is very low, the size of the drive mechanism is only about 1.5mm, a typical electrostatic drive mechanism with flat plate capacitance can provide >60V drive voltage, The contact force 1 is only about 1mN. CAE (Computer Aided Engineering) simulation technology makes the whole design process have a refreshing change. Due to the intensification of market competition, business opportunities can only be occupied by quickly meeting the various changing needs of the market for communications relay RF sensors, which objectively requires shortening of communications relay RF sensors, advantages of the design process and cost.

　　In the magnetic system design, some companies use electrostatic drive in the magnetic system driving mode, this driving mechanism is a wedge structure, composed of two movable variable capacitors formed an air gap to separate the two driving electrodes (one is a flat fixed electrode, the other electrode is a curved silicon chip called a reset spring). As shown in Figure 2, when a drive voltage is applied, an electric field is generated to generate electrostatic attraction. As the voltage rises, the curved spring blade unfolds. The wedge moves towards the end of the spring until the spring is in full contact with the flat ground electrode. When the reed is deployed to the fixed electrode, the end blade of the spring forming the contact reed is bent by itself due to the height of the convex point.

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